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Just bought a 2011 6.7 Lariat with 45000 miles. Picked this truck up from a local farmer (it was his wife's truck and has never been abused). He has always had it serviced at our local dealership and they said they have been putting Motorcraft 10w30 in it. I want to change my own engine oil just like I always have. My question is this. Is it ok to swap this truck over to Rotella T6 5w40 synthetic at 45000 miles?
 

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Sure, no problem. The new oil formulations come out next month and I'm not sure what the T6 replacement will be, but T6 should be available for a while longer. CJ-4 will be replaced by CK-4.
 
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